1 #!/bin/sh
2 #
3 # Copyright (c) 2022 Omar Polo <op@omarpolo.com>
4 #
5 # Permission to use, copy, modify, and distribute this software for any
6 # purpose with or without fee is hereby granted, provided that the above
7 # copyright notice and this permission notice appear in all copies.
8 #
9 # THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 # WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 # MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 # ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 # WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 # ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 # OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 #
17 # subst -- filter that replaces key=values pairs
18 #
19 # usage: subst key1=val1 [... keyn=valn] [files...]
20 #
21 # Use `--' before the first file if it may contain an = in its name.
22 # If no files are given, read and substitute from standard input.
23 
24 args=''
25 
26 for arg; do
27 	if [ "$arg" = '--' ]; then
28 		break
29 	fi
30 
31 	key="$(printf '%s\n' $arg | cut -s -d '=' -f1)"
32 	if [ -z "$key" ]; then
33 		break
34 	fi
35 	val="$(printf '%s\n' $arg | cut -d '=' -f 2-)"
36 	shift
37 
38 	args="$args -e s/$key/$val/g "
39 done
40 
41 exec sed $args "$@"